Update plugins.sbt (#2302)

Author: kailuowang

project/plugins.sbt

@@ -12,5 +12,5 @@ addSbtPlugin("com.github.tkawachi" % "sbt-doctest"           % "0.8.0")
 addSbtPlugin("org.xerial.sbt"      % "sbt-sonatype"          % "2.0")
 addSbtPlugin("com.47deg"           % "sbt-microsites"        % "0.7.17")
 addSbtPlugin("com.dwijnand"        % "sbt-travisci"          % "1.1.1")
-addSbtPlugin("org.lyranthe.sbt"    % "partial-unification"   % "1.1.0")
+addSbtPlugin("org.lyranthe.sbt"    % "partial-unification"   % "1.1.1")
 addSbtPlugin("org.tpolecat"        % "tut-plugin"            % "0.6.4")